Age has nothing to do with it - except in cases where dementia, Alzheimers or some other physical ailment is involved. There are also physical and mental conditions that should prohibit younger drivers from getting licenses as well.

I was always taught that driving is a privelage, not a right. That privelage can be taken away and I think that retests should be mandatory for all drivers. Yes it will cost money and time, but if you wish to have a license - you pay for it.

I think restrictions against drunk drivers should be harsher. First offense for being behind the wheel of a car while drunk should be mandatory lose of license even if there wasn't an accident. The potential is too risky.